<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>检查逻辑值</title>
</head>

<body>
    <script>
        var b1 = new Boolean(0);
        var b2 = new Boolean(1);
        var b3 = new Boolean("");
        var b4 = new Boolean(null);
        var b5 = new Boolean(NaN);
        var b6 = new Boolean("false");
        document.write("0 为布尔值 " + b1 + "<br>");
        document.write("1 为布尔值 " + b2 + "<br>");
        document.write("空字符串是布尔值 " + b3 + "<br>");
        document.write("null 是布尔值 " + b4 + "<br>");
        document.write("NaN 是布尔值 " + b5 + "<br>");
        document.write("字符串'false' 是布尔值" + b6 + "<br>");
    </script>
</body>

</html>